John bbiscoe



J. BRISCOE.

(No Model.)

RELIEF VALVE.

l No. 337,236. Patented Mar. 2, 1886.

' closed by a valve, 7, carried by a valve-stem,

Uris TATS JOHN BRISCOE, OF BOLIVAR, 'NEW YORK.

RELI EF-VALVE.

SPECIFICATION forming part. of Letters Patent No. 337,236, dated March 2, 1886.

Application filed October 16. 1884.

To all whom it may concern:

Be it known that I, JOHN BRISOOE, a citizen of the United States, residing at Bolivar, Allegany county, New York, have invented new and useful lmprovementsin Relief-Valves, of which the following isa specification.

My invention relates to that class of valves generally termed relief-valves;77 and the purpose is to provide au automatic attachment for gas, water, and steam pipes and steamengines, wherein the valve shall be closed by the pressure within the pipe and opened theinstanty such pressure is removed,thereby affording a discharge-aperture for the gas, Vapor,or liquid contained within said pipe.

To this end my invention consists in the several novel features of construction and combinations of parts hereinafter fully set forth, and detinitely pointed out in the claims.

Referring to the drawings forming part of this application, Figure l isa central-vertical section. and Fig. 2 is an elevation showing the Valve attached.

In the said drawings the reference-numeral l denotes the plug, within which the valve is arranged. This plug has a male thread cut upon its periphery, whereby it is tapped into the water, steam, or gas pipe 2, to which it may be attached. Within the plug lis formed a chamber. 3, and uponits lower end a valve seat, 4. Upon the upperend thereof is formed a bridge, 5, having a central perforation to receive the valvestem, and upon opposite sides of the said bridge are formed outlets 6, communicating with the chamber 3.

The lower end of the chanlbered plug is 8, which projects through the perforation in the bridge 5, and receives upon its threaded end a nut, 9. Upon the valve-stem Sis coiled a spring, l0, the ends whereof bear against the valve 7 and the bridge 5, normally throwing the valve from its seat.

In operation, the plug l is tapped into any pipe, whether gas, steam, or water, wherein apressure is exerted by the substance of which the pipe is a vehicle. This pressure closes the valve 7, which remains in engagement with its seat as long as the pressure continues. The moment it isxeut off the tension ot' the spring 10 throws the valve open and allows the escape of the Huid or gas remaining in the pipe.

.ing of a chamber, adapted to be tapped into Serial No. 145,691. (No model.)

This invention is intended not only for the drainage of pipes conveying water to prevent freezing after the water is cut ofi' at the main, but also to take the place of petcocks in steamengines,wherein condensation takes place upon the trst introduction of steam.

It will readily be seen that the condensed vapor will be at once discharged, as the valve will only close alter sufficient pressure is generated throughout the liue of pipe to overcome the tension of the spring by which the valve is thrown from its seat.

In engines `which require to be started and Stopped at short intervals this relief-valve prevents flooding with water while the engine is standing'.

It will be seen that by adjusting the nut up- 7o on the end of the valve-stem the throw ofthe spring may be varied to suit the` circumstances of each case.

These valves ma;7 he applied where it has heretofore been customary to insert the solid drain-plugs tapped into aT placed in the line at any suitable point or points.

Having thus described my invention, what I claim is l. In a reliefvalve, the combination of a valve-chamber adapted to be tapped and secured into any part ot' a gas, water,l or steam pipe, a valve, a valve-stem passing through and projecting outside the valvechamber, a spring acting upon the valve, and means for adjusting the resilience of such spring located upon the exterior of the chamber, substantially as described.

2. A relief-valve forpipes or tubes, consist- 9o and secured to a pipe, and provided with outlets, a valve seatedtliereina stem securedto the valve and projecting through and outside ot' the chamber, a spring seated'gwithin the chamber for normally holding the valve open, and a nut upon the stern outside ofthe chamber for adjusting the resilience of the spring, substantially as described.

In testimony whereof I alix my signature in presence of two witnesses.

JOHN BRISCOE.

Witnesses:

E. R. KILBERRY, D. J. STEWART. 

